Struct MaskSelection 

pub(crate) struct MaskSelection {
    mask: BooleanBuffer,
    selectors: OnceLock<Vec<RowSelector>>,
    count: OnceLock<usize>,
}

Mask-backed RowSelection storage.

selectors is only populated if callers use the borrowed RowSelection::iter compatibility API. Internal paths that can stream or consume the bitmap avoid this cache.

count caches the popcount; RowSelection::split_off propagates it to both halves so repeated row_count() calls do not rescan the bitmap.

Fields

mask: BooleanBuffer

selectors: OnceLock<Vec<RowSelector>>

count: OnceLock<usize>

Implementations

impl MaskSelection

pub(super) fn new(mask: BooleanBuffer) -> Self

pub(super) fn with_count(mask: BooleanBuffer, count: usize) -> Self

Create a selection whose selected-row count is already known.

pub(crate) fn mask(&self) -> &BooleanBuffer

pub(crate) fn into_mask(self) -> BooleanBuffer

pub(super) fn count(&self) -> usize

Number of selected rows, computed once and cached.

pub(super) fn cached_count(&self) -> Option<usize>

The cached selected-row count, if it has been computed.

pub(super) fn selectors(&self) -> &[RowSelector]

Trait Implementations

impl Clone for MaskSelection

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for MaskSelection

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.